Improvement in the manufacture of pottery



" unite-a swa PHILIP MARQUARDT, OF BUFFALO, NEW YORK.

Letters Patent No. 100,304,1ZatedMarch 1, 1870.

IMPROVEMENT IN THE MANUFACTURE OF POTTERY, 81c.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

Beit known that I, PHILIP MAR UARDT, of Buffalo, in the county of Erie, and State of New York,

have invented certain new and useful Improvements in the Composition and Manufacture of Pottery, 850., of which the following is a specification.

' Nature of Invention. The object of this invention is to produce a species of pottery for family vessels, 850., or that can be used for artifical stone for ornamental purposes, 850., that will stand fire, anclwhich resembles porcelain, but is porous, and consists, as I believe, in a new and better combination of component parts, of which the follow- I then add soluble glass, one (1) pint, composed of flint one'(1) part, soda and potash one (1) part, by weight, and fused and dissolved in the usual manner, and evaporated to a specific gravity of l--5, causing another decomposition, the gelatinous silica combining with the lime and alumina, the sulphuric acid with the soda and potash, forming sulphate of soda and potash, which is dissolved out by water, leaving silicate of lime and alumina. This is then ground and evaporated to the required consistency to be molded in various forms.

The articles made, when dry, are burnt or vitrified in a potters kiln to the required hardness, when the same are ready for market.

The result of this compound is cheaper and better than porcelain, which it resembles, of a handsome color, and very durable.

It is better than porcelain for certain purposes, (being porous,) such as vessels for holding water on stoves, flower-pots, 85c.

It has another great advantage, for, byadding ground flint, in quantities to suit, to the above-dcscribedcompound, the product is a beautiful light-colored stone, which can be molded into any form and hardened, making an artificial stone resembling marble, which could be used for busts, tombstones, and many other appropriate articles, ornamental. or otherwise.

What I claim is- The within clearly-described composition, the parts combined in the manner and proportion, and for the uses and purposes herein set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

PHILIP MARQUABDT.

Witnesses:

J. R. DRAKE, ALBERT HAIGHT. 

